// GtkSharp.Generation.EnumGen.cs - The Enumeration Generatable.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2001 Mike Kestner
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the GNU General Public
// License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.


namespace GtkSharp.Generation {

	using System;
	using System.Collections.Generic;
	using System.IO;
	using System.Xml;

	public class EnumGen : GenBase {
		string enum_type = String.Empty;
		IList<string> members = new List<string>();

		public EnumGen(XmlElement ns, XmlElement elem) : base(ns, elem) {
			string candidateEnumType = null;

			foreach (XmlElement member in elem.ChildNodes) {
				if (member.Name != "member")
					continue;

				string result = "\t\t" + member.GetAttribute("name");
				if (member.HasAttribute("value")) {
					string value = member.GetAttribute("value").Trim();
					var valueType = SymbolTable.Table.GetTypeFromIntegerValue(value);
					// Update the enum_type with the highest
					if (candidateEnumType == null ||
						valueType == "uint" && candidateEnumType == "int" ||
						valueType == "long" && candidateEnumType != "ulong" ||
						valueType == "ulong") {
						candidateEnumType = valueType;
					}
					result += " = " + value;
				}
				members.Add(result + ",");
			}

			if (elem.HasAttribute("enum_type")) {
				enum_type = " : " + elem.GetAttribute("enum_type");
				return;
			} else if (elem.HasAttribute("type") && (elem.GetAttribute("type") == "flags")) {
				enum_type = " : uint";
				return;
			}

			if (candidateEnumType != null && candidateEnumType != "int") {
				enum_type = $" : {candidateEnumType}";
			}
		}

		public override bool Validate() {
			return true;
		}

		public override string DefaultValue {
			get {
				return "(" + QualifiedName + ") 0";
			}
		}

		public override string MarshalType {
			get {
				return "int";
			}
		}

		public override string CallByName(string var_name) {
			return "(int) " + var_name;
		}

		public override string FromNative(string var) {
			return "(" + QualifiedName + ") " + var;
		}

		public override string GenerateAlign() {
			return null;
		}


		public override void Generate(GenerationInfo gen_info) {
			StreamWriter sw = gen_info.OpenStream(Name, NS);

			sw.WriteLine("namespace " + NS + " {");
			sw.WriteLine();
			sw.WriteLine("\tusing System;");
			sw.WriteLine("\tusing System.Runtime.InteropServices;");
			sw.WriteLine();

			sw.WriteLine("#region Autogenerated code");

			if (Elem.GetAttribute("type") == "flags")
				sw.WriteLine("\t[Flags]");
			if (Elem.HasAttribute("gtype"))
				sw.WriteLine("\t[GLib.GType (typeof (" + NS + "." + Name + "GType))]");

			string access = IsInternal ? "internal" : "public";
			sw.WriteLine("\t" + access + " enum " + Name + enum_type + " {");
			sw.WriteLine();

			foreach (string member in members)
				sw.WriteLine(member);

			sw.WriteLine("\t}");

			if (Elem.HasAttribute("gtype")) {
				sw.WriteLine();
				sw.WriteLine("\tinternal class " + Name + "GType {");
				sw.WriteLine("\t\t[DllImport (\"" + LibraryName + "\", CallingConvention = CallingConvention.Cdecl)]");
				sw.WriteLine("\t\tstatic extern IntPtr " + Elem.GetAttribute("gtype") + " ();");
				sw.WriteLine();
				sw.WriteLine("\t\tpublic static GLib.GType GType {");
				sw.WriteLine("\t\t\tget {");
				sw.WriteLine("\t\t\t\treturn new GLib.GType (" + Elem.GetAttribute("gtype") + " ());");
				sw.WriteLine("\t\t\t}");
				sw.WriteLine("\t\t}");
				sw.WriteLine("\t}");
			}

			sw.WriteLine("#endregion");
			sw.WriteLine("}");
			sw.Close();
			Statistics.EnumCount++;
		}
	}
}